Telegraph instrument.



l. S. NEWMAN.

TELEGRAPH INSIBUMENT.

APPLICATION FILED SEPT. 15. 1916.

1,299,994. Patented Apr. 8 1919.

TIIT S JOSEPH S. NEWMAN, OF CLEVELAND, OHIO.

TELEGRAPH INSTRUMENT.

Specification of Letters Patent.

Patented Apr. 8, 1919.

Application filed September 15, 1916. Serial No. 120,212.

Cleveland in the county of Cuyahoga, and

State of hio, have invented a certain new and useful Improvement in Telegraph Instruments, of which the following is a full, clear, and exact description, reference being had to the accompanying drawings.

This invention relates to an improved telegraph sounder that is especially designed for use as a toy, the primary object of the invention being to produce an eflicient device of the aforesaid character that is extremely simple of construction, economical of manufacture, and very durable.

For simplicity and cheapness I prefer to employ wood for the base of the instrument, thus avoiding the use of more expensive insulating material; and in order that it may set level upon an even supporting surface, notwithstanding the electrical connections on its underneath side, and forthe further purpose of increasing its sounding or resonant qualities, I propose to make the base of channel formation. mount an electromagnet, a key, and a frame within which the electromagnet is supported and which cooperates with the key to maintain the key in a fixed position. One side of the frame is open or divided above the magnet and one end of the open side overhangs the magnet to form a stop, while an.

armature is permanently connected to, but yieldingly supported by, a resilient metal tongue from the opposite end of said open side between the core of themagnet and the aforesaid end or stop, the armature thus constituting in effect an extension of one end of the frame. When the magnet is energized, the armature will be attracted and click against the core, and when deenergized the armature will rebound against the stop and produce a second click, as usual in instruments of this character. sons, it is desirable to make the space between the armature and the stop adjustable,

and this is accomplished in a very simple manner as will be explained hereinafter.

Other structural details which increase the efficiency while simplifying the construction of the instrument, will be observed as this description advances; and now, as I proceed to describe the invention by reference to the accompanyino drawing, I wish to be understood as not limiting myself to the structural Upon the base I For practical readetails illustrated therein further than is required by the terms of the annexed claims and is rendered necessary by the state ofthe prior art.

In-the drawings, Figure 1 is a perspective view of a telegraph sounder of my invention; Fig. 2 is an end elevation of the sounder; Fig. 8, a bottom plan thereof; and Fig. 1,2. sectional detail on line 44 of Fig. 2.

The base 1, which I have already stated is preferably made of wood, is rectangular in,

plan and channel shaped in cross section, the channel openin downward thereby to provide a pair of side flanges 2 whereon the base rests, and whereby the bottom of the base is elevated from a supporting surface.

A rectangular frame 3 rests upon the base near one end thereof, and is arranged trans-- versely of the base. An electromagnet 4: is mounted in one end of the frame. The side of the frame opposite that which rests upon the base and whereon the magnet is supported, is open, and the ends of the open side of the frame are turned inward into horizontal planes of slightly different elevations, the electromagnet being located adjacent the higher end of the frame so that said,

end overhangs it. An armature 5 is yieldingly connected to the other or lower end of the frame by a resilient plate 6, that is connected to the frame and armature by rivets 7. A set screw 8, havin a lock nut 9 is threaded through the higher end of the frame and is in a position to be engaged by the free end of the armature as it moves away from the core of the magnet. The magnet is firmly held to the baSe by a screw 10 which passes up through the base and bottom side of the frame 3 and is threaded into the lower end of the core, as suggested by dotted lines in Fig. 2.

A very simple form of key is provided by.

with the contact point wherewith the key cooperates, such contact point being formed by a bolt 14 that passes down through thebase and has a nut 15 applied to its lower end. A similar bolt 16 connects the key to the frame and base and has applied to its lower end a nut 17.

A pair of binding posts and 21 are formed by screws which are passed upward through apertures in the base and have applied to them, nuts 22 and 23, respectively, that are drawn down in firm contact with the base, knurled thumb nuts 2% being applied to the binding posts above the nuts for the purpose of clamping terminals of an electric circuit to the posts, in a common and well known manner. From the bottom plan view of the instrument, shown in Fig. 3, it will be observed that the binding post 20 has electrical connection with the bolt 14 through a wire 26; and the binding post 21 has connection through the wire 27, with one end of the winding of the electromagnet,

the wire passing upward through a perforation in thebase, as shown in Fig. 1. The opposite end 28 of the winding passes down through theibase and is connected to the bolt 16.

Assuming that theterminals of an electric circuit are connected to the binding posts, it will be seen that, upon the depression of the key, the circuit will be closed between the contact point represented by the screw lat and the key, thereby energizing the electromagnet and attracting its armature 5 which will result in a click. As soon as the key is released and the circuit broken, the magnet will be deenergized and its armature, through the influence of the spring plate 6, thrown back against the end of the set screw 4, to produce a second click. The set screw 8 may be adjusted toward and from the armature to regulate the sensitiveness of the instrument and thus adapt it to various strengths of current. The loudness of the clicks may also be varied by this adjustment, it being obvious that the wider the gap between the armature and its stops, the louder the clicks produced by its impingement thereagainst.

From the foregoing it will be seen that m y invention provides a very cheap and simple self contained instrument-self contained in that all parts are permanently secured together. The armature being permanently connected to the frame, forms an actual part of it. While I have herein disclosed the preferred embodiment of my invention, it will be understood that I do not consider all the refinements included as essential to its operableness or completeness. As an example of a simpler form, the adjusting screw 8 might be omitted; or the frame might be made of sufficiently resilient material to obviate the need of the spring 6. These modifications being so obvious, illustration is deemed unnecessary. I

Having thus described my invention, what I claim is 1. A telegraph instrument comprising an electromagnet, a frame inclosing said magnet and having an open side one end of which is opposed to and spaced from the core of the magnet, an armature yieldingly connected to the opposite end of the frame and arranged to vibrate between the first mentioned end and said core, a base whereon one side of the frame rests, a key consisting of a resilient strip that bears upon said side of the frame and is bent down over one edge thereof, a member extending through said key, the frame, and the base thereby to hold said parts together, a contact member carried by the base wherewith the key is adapted to cooperate, and an electric circuit including the winding of the electromagnet, the key, and said contact member.

2. A telegraph instrument comprising an electromagnet, a frame inclosing said magnet and having an open side, one end whereof is spaced from and opposed to the core of the magnet, an armature yieldingly connected to the opposite end of the frame and arranged to vibrate between the first mentioned end and the core of the magnet, a base having the central portion of its underneath surface inset from its edge portion, a key mounted upon said base, connecting means to which the key is attached and extending downward through the aforesaid central portion of the base, a contact member wherewith the key is adapted to cooperate, said member having a portion extending downward through the said central portion of the base, the terminals of the electric winding also extending 1 downward through such central portion, electrical connections between one end of. the wind-ing of the electromagnet and the aforesaid connecting means, binding posts having extensions which project through the aforesaid central portion of the base, and electrical connections contained within the inset portion of the base and between one binding post and the other end of the winding of the electromagnet, and between the other binding post and the aforesaid contact member.

3. A telegraph instrument comprising a downwardly opening channel base of insulating material, a frame supported by said base, an electromagnet inclosed by the frame, the frame having an open side, one end of which is spaced from and opposed to the core of the magnet, an armature yieldingly supported by the frame and adapted to vibrate between the aforesaid end and the core of the magnet, a key supported by the base, a contact member carried by the base wherewith the key is adapted to cooperate, the Winding of the electromagnet, th key, and the contact member having extensions which project downward through the base, and electrical connections between certain of said extensions within the channel of the base.

4. A telegraph instrument comprising an electromagnet, a frame inclosing said magnet and having an open side, one end of which is opposed to and spaced from the core of the magnet, an armature yieldingly c0nnected to the opposite end of the frame and arranged to vibrate between the first mentioned end and said eore, a base whereon one side of the frame rests, a key consisting of a resilient strip that bears upon said side of the frame, the key and frame having parts coeperating to hold the key against turning, a member extending through said key, the frame, and the base thereby to hold said parts together, a contact member carried by the base WhereWith the key is adapted to cooperate, and an electric circuit including the 15 winding of the electromagnet, the key, and said contact member.

In testimony whereof, I hereunto aflix my signature in the presence of two-Witnesses.

JOSEPH S. NEW'MAN.

Witnesses:

-M. E. RALEIGH,

ARNOLD L. STERN.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents,

' Washington, D. G. 

